/*
 * Copyright (c) 2020 Spotify AB.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.spotify.heroic.metric;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.google.protobuf.ByteString;
import java.io.IOException;


public class DistributionPointDeserialize extends StdDeserializer<DistributionPoint> {

    protected DistributionPointDeserialize(Class<?> vc) {
        super(vc);
    }

    public DistributionPointDeserialize() {
        this(TdigestPoint.class);
    }

    @Override
    public DistributionPoint deserialize(JsonParser jsonParser,
                                    DeserializationContext ctxt)
        throws IOException, JsonProcessingException {
        JsonNode node = jsonParser.getCodec().readTree(jsonParser);
        Distribution value = HeroicDistribution.create(ByteString.EMPTY);
        if (node != null) {
            if (node.get("value") != null) {
                byte[] bytes = node.get("value").binaryValue();
                ByteString byteString = ByteString.copyFrom(bytes);
                value = HeroicDistribution.create(byteString);
            }
        }
        long timestamp = node.get("timestamp").asLong();
        return DistributionPoint.create(value, timestamp);
    }
}
